Many years ago, I picked up these (I think) Aboriginal pieces. I've got no idea what they are/worth. Someone suggested bullroarers, but there is no hole for a cord on the lighter one, and the other is heavy like a flat club-like thing, perhaps fish whacker?

Anyway if any of you have an idea, please let me know! Here are the pics:

http://img269.imageshack.us/img269/8509/object2.jpg

http://img607.imageshack.us/img607/1750/object1z.jpg